Significance

AShell was one of many popular shells on the TI-86 and later TI-83 calculators. It was small in size and simple to use, and could run both TI-Basic and assembly programs.

Not long after AShell was released on the TI-83, SOS was released by Joe Wingbermuehle, which covered all of the functionality of AShell plus more, as well as being backwards compatible, in that it could run programs designed for AShell. This caused some tension between himself and the author of AShell, Bill Nagel[1].